International Journal of Computer Techniques

1-6

Authors: Rupinder kaur, Shruti Aggarwal

--With faster rate of depletion of fossil fuels the world has now started to greatly depend on renewable sources of energy. Wind energy is undoubtedly one of the most effective weapons to handle the situation. In this paper efforts have been taken to optimize the wind energy generation by induction generator using an embedded based controller. This paper involves a controller design which amalgamates two key functions viz. automatic voltage regulation and frequency control .The automatic voltage regulator is incorporated with the help of flux control. The proposed controller regulates the excitation current of the induction generator to regulate the generated three phase voltage. The reactive power balance of the system can be maintained within tolerable limits by using VAR condensers which is switched accordingly by the embedded controller. The frequency control can be implemented by adjusting the wind turbine pitch according to the wind inrush by measuring the wind speed. The controller provides control pulses to actuate stepper motor suitably which drives the blade to orient itself appropriately .A simulation model is also developed to illustrate this control strategy. The wind is simulated by considering the average wind characteristic

12-17

Authors: Lalit Kumar Saini, Vishal Shrivastava

A wide range of database applications are manage the time-varying data. In existing database technology gives the little support for managing such a time-varying data. The research area for temporary databases aims to change the state of affairs by characterizing the of temporal data and providing large and effective ways to model, store, and query the temporal data. This paper provides a brief introduction to temporal database research system. It concisely introduces fundamental temporal database concepts, surveys state-ofthe-art solutions to challenging aspects of temporal data management, and also offers a look into the future of temporal database research.

21-26

Authors: Dr. Zubair Khan1, Ashish Kumar2, Sunny Kumar

The purpose of this essay is to implement and study different techniques for solving Sudoku puzzles, a problem similar to graph coloring with fixed size and dependencies. Three approaches are presented and compared regarding efficiency (time needed, space required and success rate). These approaches are rule-based solving, simulated annealing, and searching for solutions. Finally the parts found to be most important for an efficient solver are combined, creating an even better solve. Sudoku puzzles involve a lot of mathematics. Of course, the puzzles are filled with numbers, but the solution process would be the same regardless of the symbols used. More interesting is the logic behind the solution process, which can provide extra satisfaction upon solving a puzzle (with a lot less erasing). In addition, the puzzles are examples of Latin squares–important in abstract algebra and in statis- tics, in experimental design